step one, if you have problems with 115200 bps or you think that you dont need that data transfer rate it is a great help for u. Giampiere Campa make a awesome library for communication Matlab-Arduino and that library is Adiosrv.pde for arduino and arduino.m and install_arudino.m.
so, you need to program again your devices with 9600 bps, example for arduino
File Arduino Modified.
step two, open Matlab ide and move this files to C:\Users\pc\Documents\MATLAB
install_arduino.m and arduino.m
i have modified this files so no problem data transfer rate, please dont try modified it.
step three, clic on install_arduino.m and then run
please check that, in your command window :D
step four, clic on arduino.m
if all right, your communication is ok, else sure it is a cause of the arduino programation i want to say, adiosrv.pde because if u have for example programed your arduino to 115200 and as i modified the library sure no conection. SO PLEASE CHECK that ALL DEVICES ARE IN 9600 BPS :)
step 6. now u can make anything my bro :)